Merge branch 'stable-6.6' into stable-6.7

* stable-6.6:
  Update to Tycho 4.0.1
  Add verification in GcKeepFilesTest that bitmaps are generated
  Express the explicit intention of creating bitmaps in GC
  GC: prune all packfiles after the loosen phase
  Prepare 5.13.3-SNAPSHOT builds
  JGit v5.13.2.202306221912-r

Change-Id: I7294c21748897eb3f94eeffbda944b62e3206c0d

diff --cc org.eclipse.jgit.packaging/pom.xml
Simple merge

diff --cc org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/GC.java
Simple merge

diff --cc org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/pack/PackWriter.java
Simple merge